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- Title
Revisiting a gravity-darkened and precessing planetary system PTFO 8-8695: A spin-orbit non-synchronous case.
- Authors
Shoya KAMIAKA; Kento MASUDA; Yuxin XUE; Yasushi SUTO; Tsubasa NISHIOKA; Risa MURAKAMI; Koichiro INAYAMA; Madoka SAITOH; Michisuke TANAKA; Atsunori YONEHARA
- Abstract
We reanalyse the time-variable light curves of the transiting planetary system PTFO 8-8695, in which a planet of 3 to 4 Jupiter masses orbits a rapidly rotating premain-sequence star. Both the planetary orbital period Porb of 0.448 d and the stellar spin period Ps of less than 0.671 d are unusually short, which makes PTFO 8-8695 an ideal system to check the model of gravity darkening and nodal precession. While the previous analysis of PTFO 8-8695 assumed that the stellar spin and planetary orbital periods are the same, we extend the analysis by discarding the spin-orbit synchronous condition, and find three different classes of solutions roughly corresponding to the nodal precession periods of 199 ± 16, 475 ± 21, and 827 ± 53 d that reproduce the transit light curves observed in 2009 and 2010. We compare the predicted light curves of the three solutions against the photometry data of a few percent accuracy obtained at Koyama Astronomical Observatory in 2014 and 2015, and find that the solution with a precession period of 199 ± 16 d is preferred even though it is preliminary. Future prospects and implications for other transiting systems are briefly discussed.
- Subjects
PLANETARY systems; LIGHT curves; JUPITER (Planet); PLANETARY mass; ORBITS (Astronomy); ASTRONOMICAL photometry
- Publication
Publications of the Astronomical Society of Japan, 2015, Vol 67, Issue 5, p94-1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psv063